Justin Bieber — Hey Selena Gomez … Beer Me

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So much for Selena Gomez being a good influence on Justin Bieber … our sources has obtained a photo of the underage singer boozing at a 4th of July party in L.A. — and Selena just stood by and watched.

The photo was snapped at a Hollywood Hills house — where the drinking age is still 21 — and as you can see, Bieber is cradling a beer bottle (Dos Equis to be exact) … squishing his crotch against Selena.

As we first reported, Selena gave Bieber another shot … reuniting with him on the condition he clean up his act, and cut the antics — pot smoking, speeding and bucket peeing — with his buddies.

Apparently, 20-year-old Selena — like almost every single college-aged kid — is still cool with underage drinking though.

As for his taste in brew — Justin Bieber doesn”t always drink beer, but when he does … he prefers to wear shorts made out of salvaged traffic cones.

Stay thirsty my friends.